The Challenger 4P is comprised of the OSI 502 (CPU) and 540 (video) cards. The Challenger 4PMF (mini-floppy) includes the OSI 505 (CPU), 527 (Memory), 540 (video), and A13 (disk connect) cards. Both have the OSI 542 (keyboard) and A15 (I/O panel).
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This was the first computer that was my own. I worte all sorts of programs in basic and even hacked a little with machine code. I only had a tape drive for it. But after a while I modified the case to build-in the cassette player. At one point it stopped working correctly, and somehow I figured out it was one of the 8T26 bus buffer chips and was able to fix it quickly. Luckily most of the chips were socket mounted, making it very easy to replace.
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